The Book Industry Study Group held a meeting last week where they looked into whether publishers, retailers, and content creators are using ISBNs the way they're supposed to. FYI: An ISBN is basically a serial number for an ebook or paper book.
The short answer is that a lot of companies are going their own way. Publishers and distributors regularly use the wrong ISBN, and while retailers should reject a title because of this they usually don't. they're more interested in getting the ebook on the market. Continue reading